For school, travel, or everyday use, messenger bags are just about the second most massively useful item for any interstellar being. Plus, they're a perfect place for you to store both your towel and your copy of the Hitchhiker's Guide to the Galaxy! We have durable bags for carrying around your laptop or whatever quest items today's adventure brings. Often these shoulder bags are separated into men's and women's, but you know what? We're going to go with "species who have shoulders" vs. "species who don't," and right now we don't happen to have any courier bags for shoulderless beings. (Sorry, Gelatinous Cube, but you look like you're already carrying plenty of stuff just fine.)